Stabelized OTA Update with Retries

main/ota_uart.h

@@ -28,6 +28,8 @@ typedef enum {
 typedef enum {
   OTA_FEED_OK = 0,
   OTA_FEED_BLOCK_WRITTEN,
+  OTA_FEED_SEQ_DUP,
+  OTA_FEED_SEQ_GAP,
   OTA_FEED_ERROR,
 } ota_feed_result_t;
 
@@ -41,8 +43,14 @@ int ota_uart_prepare(uint32_t total_size);
 
 void ota_uart_abort(void);
 
-/** Append up to 200 bytes; flushes 4 KiB blocks to flash when full. */
-ota_feed_result_t ota_uart_feed(const uint8_t *data, size_t len);
+/**
+ * Append up to 200 bytes with strict seq checking (0, 1, 2, …).
+ * Duplicates (seq < expected) return OTA_FEED_SEQ_DUP; gaps return OTA_FEED_SEQ_GAP.
+ */
+ota_feed_result_t ota_uart_feed_chunk(uint32_t seq, const uint8_t *data, size_t len);
+
+/** True when a full 4 KiB block is in flash (used to re-ACK host block retries). */
+bool ota_uart_block_ready_for_reack(void);
 
 uint32_t ota_uart_bytes_written(void);